Title:
Effect of Lightweight Aggregate on Early-Age Autogenous Shrinkage of Concrete
Author(s):
Tao Ji, Bin-bin Zhang, Yi-Zhou Zhuang, and Hwai-Chung Wu
Publication:
Materials Journal
Volume:
112
Issue:
3
Appears on pages(s):
355-364
Keywords:
coefficient of thermal expansion; early-age autogenous shrinkage; hardening phase; lightweight aggregate; liquid phase; skeletonformational phase
DOI:
10.14359/51687229
Date:
5/1/2015
Abstract:
The total early-age shrinkage and coefficient of thermal expansion of concrete were measured by a corrugated pipe system. The effects of prewetted and dry lightweight coarse aggregate (LWA) on the autogenous shrinkage of concrete at early age (1 day), including liquid phase, skeleton-formational phase, and hardening phase, were investigated and discussed. It was confirmed that the early-age autogenous shrinkage of concrete depends on the constraint intensity on the hardening cement paste (HCP) by coarse aggregate and the effective water-cement ratio (w/c). The effective w/c has a much stronger influence during the liquid phase than other two phases; however, the constraint imposed by coarse aggregate becomes the dominant factor during the skeleton-formational phase. During the hardening phase, concrete made with prewetted LWA expands; at the same time, the chemical shrinkage and self-desiccation are insignificant.
Related References:
1. Bentz, D. P., and Weiss, W. J., “Internal Curing: A 2010 State-of-the-Art Review,” U.S. Department of Commerce, National Institute of Standards and Technology, 2011.
2. Holt, E. E., Early Age Autogenous Shrinkage of Concrete, VTT Publications, Espoo, Finland, 2001, 197 pp.
3. Kohno, K.; Okamoto, T.; Isikawa, Y.; Sibata, T.; and Mori, H., “Effects of Artificial Lightweight Aggregate on Autogenous Shrinkage of Concrete,” Cement and Concrete Research, V. 29, No. 4, 1999, pp. 611-614. doi: 10.1016/S0008-8846(98)00202-6
4. Zhutovsky, S.; Kovler, K.; and Bentur, A., “Efficiency of Lightweight Aggregates for Internal Curing of High Strength Concrete to Eliminate Autogenous Shrinkage,” Materials and Structures, V. 35, No. 2, 2002, pp. 97-101. doi: 10.1007/BF02482108
5. Zhuang, Y. Z.; Chen, C. Y.; and Ji, T., “Effect of Shale Ceramsite Type on the Tensile Creep of Lightweight Aggregate Concrete,” Construction & Building Materials, V. 46, 2013, pp. 13-18. doi: 10.1016/j.conbuildmat.2013.04.013
6. Li, Y.; Bao, J.; and Guo, Y., “The Relationship between Autogenous Shrinkage and Pore Structure of Cement Paste with Mineral Admixtures,” Construction & Building Materials, V. 24, No. 10, 2010, pp. 1855-1860. doi: 10.1016/j.conbuildmat.2010.04.018
7. Holt, E., “Contribution of Mixture Design to Chemical and Autogenous Shrinkage of Concrete at Early Ages,” Cement and Concrete Research, V. 35, No. 3, 2005, pp. 464-472. doi: 10.1016/j.cemconres.2004.05.009
8. Tazawa, E.; Miyazawa, S.; and Kasai, T., “Chemical Shrinkage and Autogenous Shrinkage of Hydrating Cement Paste,” Cement and Concrete Research, V. 25, No. 2, 1995, pp. 288-292. doi: 10.1016/0008-8846(95)00011-9
9. Uno, P. J., “Plastic Shrinkage Cracking and Evaporation Formulas,” ACI Materials Journal, V. 95, No. 4, July-Aug. 1998, pp. 365-375.
10. Bentz, D. P., and Jensen, O. M., “Mitigation Strategies for Autogenous Shrinkage Cracking,” Cement and Concrete Composites, V. 26, No. 6, 2004, pp. 677-685. doi: 10.1016/S0958-9465(03)00045-3
11. Akcay, B., and Tasdemir, M. A., “Effects of Distribution of Lightweight Aggregates on Internal Curing of Concrete,” Cement and Concrete Composites, V. 32, No. 8, 2010, pp. 611-616. doi: 10.1016/j.cemconcomp.2010.07.003
12. Şahmaran, M.; Lachemi, M.; Hossain, K. M. A.; and Li, V. C., “Internal Curing of Engineered Cementitious Composites for Prevention of Early Age Autogenous Shrinkage Cracking,” Cement and Concrete Research, V. 39, No. 10, 2009, pp. 893-901. doi: 10.1016/j.cemconres.2009.07.006
13. Ye, J. J., “Effect of Pre-wetted Light-weight Aggregate on Internal Relative Humidity and Autogenous Shrinkage of Concrete,” Journal of Wuhan University of Technology (Materials Science Edition), 2006, pp. 134-137.
14. Cusson, D., and Hoogeveen, T., “Internal Curing of High-Performance Concrete with Pre-soaked Fine Lightweight Aggregate for Prevention of Autogenous Shrinkage Cracking,” Cement and Concrete Research, V. 38, No. 6, 2008, pp. 757-765. doi: 10.1016/j.cemconres.2008.02.001
15. Chinese Standard, “Technical Specification for Lightweight Coarse Aggregate Concrete (JGJ 51-2002),” China Building Industry Press, Beijing, China, 2003.
16. Zhang, J.; Cusson, D.; Mitchell, L.; Hoogeveen, T.; and Margeson, J., “The Maturity Approach for Predicting Different Properties of High-Performance Concrete,” Proceedings of the 7th International Symposium on Utilization of High-Strength/High-Performance Concrete, Washington DC, 2005, pp. 135-154.
17. Ji, T.; Chen, C. Y.; Zhuang, Y. Z.; and Lin, X. J., “Effect of Degree of Ceramsite Prewetting on the Cracking Behavior of LWAC,” Magazine of Concrete Research, V. 64, No. 1, 2012, pp. 1-9.
18. Chinese Standard, “Standard of Test Method of Performance on Ordinary Fresh Concrete (GB/T 50080-2002),” China Building Industry Press, Beijing, China, 2003.
19. Chinese Standard, “Mechanics Performance Testing Method Standard of Ordinary Concrete (GB50081-2002),” China Building Industry Press, Beijing, China, 2003.
20. Cusson, D., and Hoogeveen, T., “An Experimental Approach for the Analysis of Early-Age Behaviour of High-Performance Concrete Structures under Restrained Shrinkage,” Cement and Concrete Research, V. 37, No. 2, 2007, pp. 200-209. doi: 10.1016/j.cemconres.2006.11.005
21. Mehta, P. K., and Paulo, J. M., Concrete: Structure, Properties and Materials, Prentice Hall, Upper Saddle River, NJ, 1993, 548 pp.